The new TD100 instrument preamp and tube direct box from Summit Audio features a hybrid signal path utilizing both a discrete solid state output device and a 12AX7A/ECC83 vacuum tube to give your musical instruments the clarity of class A sound with the richness and warmth of vacuum tubes all in a 1/2 rack unit. Perfect for both live and studio use, the Summit TD-100 offers both XLR microphone level and 1/4" TRS line level outputs, plus variable input impedance, polarity switch and ground lift, signal and overdrive LEDs, and even a headphone output for use as a practice device. All with the quality that says Summit Audio.